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>Can any one tell me which is good refrecence book for XML
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There are many, but with a fast-evolving subject like XML, it is hard to find a book that does not have some obsolete chapters.

Of the older ones I like:
XML in Action, William J. Pardi, March 1999, Microsoft Press ISBN 0735605629

Wrox press has many good books too.

An there are many references on line like
xml.com and MSDN.

HTH